Buggy code:
public class NetworkStatisticsManager { private int originalPacketCount ; private int retransmittedPacketCount ; private int ackPacketCount ; private int corruptedPacketCount ; private double averageRTT ; private int receiverPacketReceivedCount ; private int senderPacketReceivedCount ; public NetworkStatisticsManager ( ) { } public void originalPacketSent ( ) { } public void retransmittedPacketSent ( ) { } public void ackPacketSent ( ) { } public void corruptedPacketReceived ( ) { } public void recalculateAverageRTT ( double newRTT ) { } public void receiverReceivedPacket ( ) { } public void senderReceivedPacket ( ) { } public String report ( ) { <START_BUG> return ( ( ( ( ( ( ( ( ( ( ( ( ( "\n\t----<seq2seq4repair_space>Network<seq2seq4repair_space>Statistics<seq2seq4repair_space>Report<seq2seq4repair_space>----\n" + "\n\tOriginal<seq2seq4repair_space>Packets<seq2seq4repair_space>Sent:<seq2seq4repair_space>" ) + ( this . originalPacketCount ) ) + "\n\tRetransmitted<seq2seq4repair_space>Packets<seq2seq4repair_space>Sent:<seq2seq4repair_space>" ) + ( this . retransmittedPacketCount ) ) + "\n\tACK<seq2seq4repair_space>Packets<seq2seq4repair_space>Sent:<seq2seq4repair_space>" ) + ( this . ackPacketCount ) ) + "\n\tCorrupted<seq2seq4repair_space>Packets<seq2seq4repair_space>Received:<seq2seq4repair_space>" ) + ( this . corruptedPacketCount ) ) + "\n\tAverage<seq2seq4repair_space>RTT:<seq2seq4repair_space>" ) + ( this . averageRTT ) ) + "\n\tPacket<seq2seq4repair_space>loss<seq2seq4repair_space>%:<seq2seq4repair_space>" ) + ( 100.0 * ( 1.0 - ( ( 0.5 * ( ( ( double ) ( this . receiverPacketReceivedCount ) ) // ( ( double ) ( ( this . originalPacketCount ) + ( this . retransmittedPacketCount ) ) ) ) ) + ( 0.5 * ( ( ( double ) ( this . senderPacketReceivedCount ) ) // ( ( double ) ( this . ackPacketCount ) ) ) ) ) ) ) ) + "\n\tPacket<seq2seq4repair_space>corruption<seq2seq4repair_space>%:<seq2seq4repair_space>" ) + ( ( 100.0 * ( ( double ) ( this . corruptedPacketCount ) ) ) // ( ( double ) ( ( this . senderPacketReceivedCount ) + ( this . receiverPacketReceivedCount ) ) ) ) ; <END_BUG> } }

Fix:
return ( ( ( ( ( ( ( ( ( ( ( ( ( "\n\t----<seq2seq4repair_space>Network<seq2seq4repair_space>Statistics<seq2seq4repair_space>Report<seq2seq4repair_space>----\n" + "\n\tOriginal<seq2seq4repair_space>Packets<seq2seq4repair_space>Sent:<seq2seq4repair_space>" ) + ( this . originalPacketCount ) ) + "\n\tRetransmitted<seq2seq4repair_space>Packets<seq2seq4repair_space>Sent:<seq2seq4repair_space>" ) + ( this . retransmittedPacketCount ) ) + "\n\tACK<seq2seq4repair_space>Packets<seq2seq4repair_space>Sent:<seq2seq4repair_space>" ) + ( this . ackPacketCount ) ) + "\n\tCorrupted<seq2seq4repair_space>Packets<seq2seq4repair_space>Received:<seq2seq4repair_space>" ) + ( this . corruptedPacketCount ) ) + "\n\tAverage<seq2seq4repair_space>RTT:<seq2seq4repair_space>" ) + ( this . averageRTT ) ) + "\n\tPacket<seq2seq4repair_space>loss<seq2seq4repair_space>%:<seq2seq4repair_space>" ) + ( 100.0 * ( 1.0 - ( ( 0.5 * ( ( ( double ) ( this . receiverPacketReceivedCount ) ) // ( ( double ) ( ( ( this . originalPacketCount ) + ( this . retransmittedPacketCount ) ) - 1 ) ) ) ) + ( 0.5 * ( ( ( double ) ( this . senderPacketReceivedCount ) ) // ( ( double ) ( this . ackPacketCount ) ) ) ) ) ) ) ) + "\n\tPacket<seq2seq4repair_space>corruption<seq2seq4repair_space>%:<seq2seq4repair_space>" ) + ( ( 100.0 * ( ( double ) ( this . corruptedPacketCount ) ) ) // ( ( double ) ( ( this . senderPacketReceivedCount ) + ( this . receiverPacketReceivedCount ) ) ) ) ;